7994139878 has 8 divisors (see below), whose sum is σ = 11991589272. Its totient is φ = 3996943456.

The previous prime is 7994139871. The next prime is 7994139883. The reversal of 7994139878 is 8789314997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7994139871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90926 + ... + 155742.

It is an arithmetic number, because the mean of its divisors is an integer number (1498948659).

Almost surely, 2^7994139878 is an apocalyptic number.

7994139878 is a deficient number, since it is larger than the sum of its proper divisors (3997449394).

7994139878 is a wasteful number, since it uses less digits than its factorization.

7994139878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126486.

The product of its digits is 27433728, while the sum is 65.

The square root of 7994139878 is about 89409.9540207912. The cubic root of 7994139878 is about 1999.5115372118.

The spelling of 7994139878 in words is "seven billion, nine hundred ninety-four million, one hundred thirty-nine thousand, eight hundred seventy-eight".